src/third_party/skia/bench/PerlinNoiseBench.cpp

/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "bench/Benchmark.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkShader.h"
#include "include/effects/SkPerlinNoiseShader.h"

class PerlinNoiseBench : public Benchmark {
    SkISize fSize;

public:
    PerlinNoiseBench()  {
        fSize = SkISize::Make(80, 80);
    }

protected:
    const char* onGetName() override {
        return "perlinnoise";
    }

    void onDraw(int loops, SkCanvas* canvas) override {
        this->test(loops, canvas, 0, 0, 0.1f, 0.1f, 3, 0, false);
    }

private:
    void drawClippedRect(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
        canvas->save();
        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
                         SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height())));
        SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
                                    SkIntToScalar(fSize.width()),
                                    SkIntToScalar(fSize.height()));
        canvas->drawRect(r, paint);
        canvas->restore();
    }

    void test(int loops, SkCanvas* canvas, int x, int y,
              float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
              bool stitchTiles) {
        SkPaint paint;
        paint.setShader(SkPerlinNoiseShader::MakeFractalNoise(baseFrequencyX, baseFrequencyY,
                                                              numOctaves, seed,
                                                              stitchTiles ? &fSize : nullptr));
        for (int i = 0; i < loops; i++) {
            this->drawClippedRect(canvas, x, y, paint);
        }
    }

    typedef Benchmark INHERITED;
};

///////////////////////////////////////////////////////////////////////////////

DEF_BENCH( return new PerlinNoiseBench(); )